Selective air circulating and cooling system



NOV. 1, 1955 B, CONES SELECTIVE AIR CIRCULATING AND COOLING SYSTEM Filed May 16, 1952 llllllllllllll 1. praz.

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mi I @m www United States Patent O SELECTIVE AIR CIRCULATING AND COOLING SYSTEM Ben Cones, Indianapolis, Ind.

Application May 16, 1952, Serial No. 288,270

1 Claim. (Cl. 98-38) It is now common practice to require particularly in schoolrooms a predetermined circulation of fresh air to air already in the room, that is to recirculate a definite proportion of the air within the room with a fresh supply of incoming air. The fresh air being introduced is normally heated in order to provide the correct temperature of the air combined in the room.

The present invention contemplates utilizing this same recirculating system and applying thereto means for cutting off the recirculation of the room air with the newly introduced fresh air and to provide means for supplying an extra quantity of cool fresh air which may be applied to the room through the normal air distributing system.

A primary advantage of the invention lies in the fact that no additional conduit system need be installed in order to supply the cooler air when the room is to be cooled rather than to be heated, and when the air does not need to be recirculated as it would have to be in case the air was warmed.

A further important advantage of the invention resides in the fact that the switch over from the air recirculating system to the fresh air cooling system may be accomplished simply by operating a single damper.

These and many other objects and advantages of the invention will become apparent to those versed in the art in the following description of one particular form as illustrated in the accompanying drawing, in which:

Fig. l is a view in elevation and partial section of a side wall of a room embodying the installation of the invention;

Fig. 2 is a vertical section view on the line 2 2 in Fig. 1; and

Fig. 3 is a view in reduced scale in transverse section on the line 3-3 in Fig. 2.

The system embodies a pair of vertically disposed ducts or lines and 11. The flue 10 has an opening 12 at the oor level, and an opening 13 at an upper level adjacent the ceiling 14. The ue 10 is closed olf above the opening 13.

The ue 11 constitutes an exhaust ue and has a single opening 1S at the iloor level, from which air may flow vertically through the ue 11 to escape normally into the atmosphere above the ceiling 14.

An air supply duct 16 is provided to conduct air from any suitable source under pressure induced by a blower or a fan (not shown). A standpipe 17 leads from the duct 16 through the iloor 18 into the interior of the flue 10 to extend by an upper end portion a slight distance above the opening 12. The pipe 17 is provided with a diffusing member 19. In this regard, attention is directed to my Patent No. 2,543,152 issued February 27, 1951, showing the construction and operation of the member 19. It is su'icient to state herein that this member 19 serves as an air induction means and also an air diffusing means in respect to the fact that as the air is conducted upwardly through the pipe 17, the member 19 diffuses that air, and also serves to induce a ilow of air from the room through the opening 12 into the ue 10. When the opening 12 is allowed to function in its normal manner, warm air is being supplied through the duct 16 to discharge around the diffusing member 19 into the ilue 10, inducing a ow of air from the room into the flue 10 through the opening 12 to intermix with the fresh air entering the flue, and the combined mixture is returned to the room through the upper opening 13.

While this recirculation of air is going on, and new air is being supplied, air is also escaping from the room through the opening 15 and up and out of the flue 11. The openings 12, 15, 13, and the rate of ow of air through the pipe 17 are correlated to that extent whereby the specifications may be met to provide for a recirculation of two-thirds of the air within the room with onethird new or fresh air being added, the other one-third of the old air escaping through the opening 15. That is, air coming out the opening 13 slightly pressurizes the room to set up these various ilows, as have been indicated.

Now to that structure there is added a duct branch 20, herein shown as rectangular in shape in cross section, leading from the duct 16 to open through the oor 18 into the bottom end of the flue 10. Normally, the upper end of the branch duct 20 will be closed by a damper 21. Any suitable means may be employed to retain the damper 21 in this normal closed position, a spring 22 being herein shown as attached by one end to an outer free end portion of the damper 21 and to the side wall of the duct 20, Fig. 2. The damper 21 is hinged at that side which is adjacent the lower end of the flue 10 at the lower side of the opening 12. The damper 21 is made to be of that area so that when it is pulled upwardly to have its outer edge follow the dash line, Fig. 2, it may close off the opening 12, and the damper may be held in a closed-off position by any suitable means, herein shown as by a cable 23 extending through a bracket 24 and having a knot 25 to drop down into a slot 26 provided in the bracket.

The damper 21 is pulled to this open position and maintained there to stop the recirculation of air from the room through the opening 12, and to allow cool air then being carried by the duct 16 to enter into the flue 10 in a greater volume than will permissibly be owed through the pipe 17, although the pipe 17 still serves to conduct some of the cool air into the flue. The air thus coming up through the branch duct 20 into the ilue 10 can escape only through the opening 13 and into the room, again slightly pressurizing the room, and the warmer air will be forced out through intermixture with the cooler air and under the pressure thus induced through the opening 15 and out the llue 11.

By this means, not only is the cooler air introduced from the duct 16 through the opening 13, but the air so introduced is diffused through the air in the room to set up a slight movement of the air to aid in the reaction to the normal human being of sensible movement of the air.

Therefore it is to be seen that for the purposes required, I have produced a very simple structure as described and shown in the one precise form, but I do not desire to be limited to that precise form beyond the limitations which may be imposed by the following claim.

I claim:

In a room air circulating system, the combination of an air supply flue extending vertically from the floor substantially to the ceiling of the room and having one opening to the room at the floor level and a second opening to the room near the ceiling, the supply flue being closed olf above said one opening; an exhaust flue extending from the room ioor vertically beyond said ceiling, opening at a distance thereabove and outside of the room, and having an opening from the room at said oor level; a pressurized air supply duct; a pipe extending from the duct Vand vertically rising within said supply ue and terminating at a distance above said one opening of the supply ue; an air injector nozzle on the upper end of said pipe within the supply ue; a second pipe leading from said duct and opening into said supply ue at the oor level thereof; and a damper normally seated over said second pipe opening and shiftable from its seated position to a position closing said supply ue one opening; said air supply duct being selectively pressurized for warm and fresh air flows; said damper in said seated position confining discharge from said duct under Warm air flow to discharge through said pipe and nozzle inducing air ow into said supply flue from the room through said opening, and in said one opening closure position requiring all fresh air coming from said duct to discharge from said opening of said second supply ue with no air ow through said one opening.

References Cited in the file of this patent UNITED STATES PATENTS 485,141 Smith Oct. 25, 1892 509,332 Smith Nov. 21, 1893 1,832,638 Kitchen Nov. 17, 1931 2,406,643 Spieth Aug. 27, 1946 2,620,983 Lyman Dec. 9, 1952 2,663,244 MacDoWell n Dec. 22, 1953 FOREIGN PATENTS 288,675 Italy a ..f. Sept. 18, 1931 379,430 Great Britain Sept. 1, 1932 

